Reaction is P4+6I2---> 4PI3
It says what mass of P4 is needed to produce 52.6 g of PI3if the reaction has an 86% yield?
what does the % yield mean for this? is the 52.6 g 86 % and i have to solve this using the 100% yield, or is the 52.6 g 100% yield and i have to solve this problem using 86% of it?
im confused.
someone plz help!
2006-10-04 10:24:06 · 4 answers · asked by Anonymous in Science & Mathematics ➔ Chemistry
what is the right answer for this?
2006-10-04 10:29:50 · update #1
i got 4.60 grams of it, but my friend said that u have to find 86% of that (which is about 45.236 g of 52.6 g..) and then the answer comes out to 3.40--its a multiple choice problem and both answers are there, but it says 3.45, idk if thats wrong?
im confused! but thanks!
2006-10-04 10:49:36 · update #2
If the reaction has a 86 % yield, this means that theoretically, 61.16 g of PI3 could have been produced from the reactants.
(52.6 g is 86 % of 61.16 g)
So, 61.19 g/ 411.687 g/mol = 0.148 mol of PI3
The ratio of P4 to PI3 is 1:4, so you would need
0.03716 mol of P4, or 4.60 g of it.
2006-10-04 10:45:23 · answer #1 · answered by wibblytums 5 · 0⤊ 0⤋
I would forget about the 86% until the very end. Figure the mass of P based on 100% and then divide it by 0.86.
I agree, 86% yield is poorly defined here, if at all. You don't know whether the P or the I is in short supply for the reaction.
2006-10-04 17:33:17 · answer #2 · answered by Steve 7 · 0⤊ 0⤋
At wts
P 24
I 127
mol wt
PI3 3*127+24=405
P is 24/405=5.9%
52.6g PI3 requires 52.6*.059=3.12g of P
If the yield is 86% you need 3.12/.86=3.62g of P
2006-10-04 18:17:21 · answer #3 · answered by yupchagee 7 · 0⤊ 0⤋
Wish I could help you but it has been 25 yrs since I took chemistry. I am totally confused as well. I don't remember anything like this when I took chemisty. I am sorry wish I could help good luck.
2006-10-04 17:38:43 · answer #4 · answered by miamac49616 4 · 0⤊ 0⤋